hot water tank problem

Just went downstairs in my basement to find a good size puddle under my hotwater tank. I just recently put a bucket under what I want to say is the drain pipe coming out of the side of my tank to the floor. It has a pressure release value on it and a 3/4 pipe that extense to the floor(dont knot the tech. name for it sorry) but anyways lived in the house for year and a half now and never had this issue before. Just checked the bucket and found a little water in it. The drain pipe drips every now and then that I can see. Just wanted to know the reason for this and do I have a problem with my tank and if so what can i do to fix it.
thanks

I know for a fact that no one has touched the temp on the hotwater tank. Its just me and my wife and she would never go near the thing. The valve can just go like that? It seems like the valve is never really used unless I am mistaken which is probaly the case but I will check the temp. and if its right i will change the valve thanks

Sometimes they can have a funny moment and drip but like the poster above says just release some pressure from the tank via the Pressure release valve and it may be fine. 90% of the time this happens that will fix the issue. If not then it's a simple fix to replace the valve.